Looking at the video clip it seems to me its quite a surprise that the fight was stopped. Listening to the commentary of the previous round it was all about Vitali is on top, Lewis is shot and cant hardly stand, and Vitalis just got to keep going and he will win.

So why at that point was it stopped, either:

1. The cut - but Lenoox was shot by that point so it couldnt have got any worse
2. The powers that be didnt want Lennox to lose, and by that round it was looking like he would.

Theres a lot of people who think option 2, and Im one of them. It was a very fast decision straight after the bell - they didnt even ask the cornermen or Vitali... i think it was highly questionable